We were surprised that he could _____ work out the hard problem.(easy)

问题描述:

We were surprised that he could _____ work out the hard problem.(easy)

easily
that 从句中不缺任何成分,这种情况下,即可.
这是填写副词的窍门,楼主记住:当某一句不缺任何成份时,只需填上所给单词的副词就是答案了.而且副词用在助动词(could) 和谓语动词(work out) 之间是最常见的位置了.
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